listen to soleron he knows what hes talking about, and in the most case you dont need anything to terribly good except for a graphics card, my old computer that i use here and there has 2gb ddr2 666 ram in it an AMD 64x2 clocked at 2.6ghz running windows XP but i have an ATI Radeon 4670 and am able to play borderlands on max 1280 x 960 resolution (i know its no crysis), if i had extra money to blow id upgrade my ram and throw in a HD 5850 or 5870. For the most part if your gonna be dedicating it to games id suggest a Phenom 2, at least 2GB of DDR2 1066 or higher ram , and an HD 5850 graphics card. that'll keep you good for quite a while specially since the new radeon cards support direct x 11 all you would need in a few years might be to upgrade the graphics card
